252 DURHAM DIPTERA. 



XXXIII. 450. 



54 (53). Hinderside of mid tibiae with only two bristles. 



1970. Hyedotesia variegata, Mg. 

 Hesleden, Bishop Auckland, 3 $ and 7 ?, June- 

 September, 1897-1902. Dr. Meade in his list 

 gives scutellaris, Fin., as identical with populi, Mg., 

 and says it is very common, variegata, Mg., being 

 very rare ; and gives the colour of antenna?, &c, as 

 character marks. Mr. Verrall gives scutellaris, 

 Fin., and populi, Mg., as distinct, and omits 

 variegata, Mg. Herr Stein writes me that the 

 above specimens are certainly variegata, Mg., the 

 type of which he knows. He adds, populi, Mg., is 

 identical with scutellaris, Fin., the colour of the 

 antennas and shoulders is quite immaterial ; and he 

 then gives the characters used above. So that 

 apparently the common yellow Hyedotesia, here at 

 least, is variegata and not scutellaris-populi. 



55 (52). Arista short haired ; abdomen spotted. 



(1968. abdominalis, Ztt.) 

 66 (51). Thorax as well as abdomen pale; arista with long 

 hairs. 



197 1. Hyedotesia pallida, F. 



Shipley, 3 $, July, 1900. They belong to the variety, 

 if it be a variety, with four broad black stripes on 

 the dorsum, and the last two abdominal segments 

 darkened. I found them in a wooded glen resting 

 on Pteris aquilina. 



451. Allceostylus, Schnbl. 



1 (2). Arista short haired. ( J 97 2 - simplex, W.) 



2 (1). Arista pubescent. 



8 (4). Dorsum striped ; fore femora nigrescent. 



(1973. sudeticus, Schnbl.) 

 4 (3). Dorsum plain ; all femora pale. 



1974. Alloeostylus flaveola, Fin. 

 Bishop Auckland, 2 ?, July, 1902. 



